Re: [PATCH bpf-next v3 2/4] bpf: Add log for attaching tracing programs to functions in deny list

On 7/22/25 8:34 AM, KaFai Wan wrote:

Show the rejected function name when attaching tracing programs to functions in deny list.

With this change, we know why tracing programs can't attach to functions like migrate_disable() from log.

$ ./fentry libbpf: prog 'migrate_disable': BPF program load failed: -EINVAL libbpf: prog 'migrate_disable': -- BEGIN PROG LOAD LOG -- Attaching tracing programs to function 'migrate_disable' is rejected.

Suggested-by: Leon Hwang leon.hwang@linux.dev Signed-off-by: KaFai Wan kafai.wan@linux.dev

Acked-by: Yonghong Song yonghong.song@linux.dev